CN204718653U - A kind of distributed stream gauge - Google Patents

Abstract

The utility model discloses a distributed flowmeter, which comprises a pipeline, the two ends of which are connected with pipeline flanges, the pipeline is connected with short pipe a and short pipe b, and the short pipe a and short pipe b are respectively connected with pressure-taking Valve a and pressure sensing valve b, pressure sensing valve a and pressure sensing valve b are respectively connected to the differential pressure transmitter through pipe a and pipe b, and a balance valve is connected between pipe a and pipe b; the throttling valve is fixed in the pipe On the circular plate, several edge through holes are uniformly arranged on the throttling circular plate, a through hole a is arranged at the center of the throttling circular plate, and a rectifying device is connected to the throttling circular plate. A distributed flow meter is equipped with a rectification device, and the fluid in the pipeline passes through the rectification device, so that the fluid outlet velocity gradient in the pipeline is reduced, the pressure distribution is more uniform, the pressure is more stable, and it is beneficial to improve the accuracy of the flowmeter. The distributed rectification of the flow field and the optimization of the inlet shape are conducive to improving the outflow coefficient, and at the same time reducing the vortex intensity and reducing the permanent pressure loss.

Description

A Distributed Flow Meter

technical field

The utility model belongs to the technical field of flow meters and relates to a distributed flow meter.

Background technique

A differential pressure flowmeter is an instrument that measures flow through differential pressure. It uses the principle that there is a certain relationship between the pressure difference and the flow rate generated when the fluid flows through the rectification device, and the flow measurement is realized by measuring the differential pressure. A rectifier is a locally constricted element installed in the pipeline, most commonly with orifice plates, nozzles and venturi tubes. The straight pipe section of the porous orifice plate on the market is long, the permanent pressure loss is high when measuring the flow rate, and the outflow coefficient is as low as 0.6.

Utility model content

The purpose of the utility model is to provide a distributed flowmeter, which can improve the outflow coefficient and reduce the permanent pressure loss.

The technical solution adopted by the utility model is: a distributed flow meter, including a pipeline, the two ends of the pipeline are connected with pipeline flanges, the pipeline is connected with a short pipe a and a short pipe b, and the short pipe a and the short pipe b are connected to each other. The pressure detecting valve a and the pressure detecting valve b are respectively connected, and the pressure detecting valve a and the pressure detecting valve b are respectively connected to the differential pressure transmitter through the pipeline a and the pipeline b, and a balance valve is connected between the pipeline a and the pipeline b;

A throttling circular plate is fixed inside the pipeline, and several edge through holes are uniformly arranged on the throttling circular plate, a through hole a is arranged at the center of the throttling circular plate, and a rectifying device is connected to the throttling circular plate.

The utility model is also characterized in that,

Both ends of the edge through hole are provided with chamfers or rounded corners.

The rectification device includes a conical truncated a, the large-diameter end of the conical truncated a is connected to one side of the throttling circular plate, a through hole b is arranged in the conical truncated a, the diameter of the small-diameter end of the conical truncated a is the same as that of the through hole b, and the through hole The diameter of b is the same as that of the through hole a, and the centers of the through hole b and the through hole a are located on the same straight line.

The unconnected ends of the through hole b and the through hole a are provided with chamfers or rounded corners.

The rectification device includes a conical truncated b, the large-diameter end of the conical truncated b is connected to the other side of the throttling circular plate, a tapered hole is arranged in the conical truncated b, the small-diameter end of the tapered hole is the same diameter as the through hole a, and the tapered hole is connected to the through hole a. The center of the hole a is located on the same straight line, and the diameter of the major diameter end of the tapered hole is the same as that of the truncated cone b.

The unconnected ends of the through hole b and the tapered hole are provided with chamfers or rounded corners.

The rectification device includes a cone a and a cone b, the bottoms of the cone a and the cone b are connected with the throttling disc, the throttling disc, the cone a and the cone b are coaxial, and the cone a and the cone b Located on opposite sides of the throttle circular plate.

The cone angle of cone a is 30°-90°, and the cone angle of cone b is 60°-150°.

The rectification device includes a cone c, a truncated cone c and a cone d, the throttling disc, the cone c, the truncated cone c and the cone d are coaxial, and the large diameter end of the truncated cone c and the bottom of the cone d are connected to the node The flow disk is connected, the truncated cone c and the cone d are located on opposite sides of the throttling disk, the large diameter end of the truncated cone c is the same diameter as the bottom circle of the cone d, and the small diameter end of the truncated cone c is connected to the bottom surface of the cone c The diameters of the circles are the same, and the small diameter end of the truncated cone c is connected with the bottom surface of the cone c.

The edge holes are round holes or scalloped holes.

The beneficial effects of the utility model are:

1) A distributed flow meter is equipped with a rectification device and a throttle disc, and the fluid in the pipeline passes through the rectification device and the throttle disc, so that the fluid outlet velocity gradient in the pipeline is reduced, the pressure distribution is more uniform, and the pressure is more accurate. Stable, which is conducive to improving the accuracy of the flowmeter. The distributed rectification of the flow field and the optimization of the inlet shape are beneficial to improve the outflow coefficient. Since the fluid velocity and pressure gradient in the pipeline is reduced, the eddy current intensity is reduced at the same time, the pressure is more stable, and the range ratio can be improved. Because the fluid velocity and pressure gradient in the pipeline is reduced, and the eddy current intensity is reduced, the permanent pressure loss is reduced.

2) Pressure sensing valve a, pressure sensing valve b and balance valve constitute an external three-valve group to complete the pressure sensing and zero adjustment of differential pressure transmitters, reducing faults and leakage points, and reducing the risk caused by the three valves during measurement. The additional error brought by the group improves the reliability of the measurement pipeline.

Description of drawings

Fig. 1 is the structural representation of a kind of distributed flow meter of the present utility model;

Fig. 2 is a structural schematic diagram of Embodiment 1 of a rectifying device in a distributed flowmeter of the present invention;

Fig. 3 is a structural schematic diagram of Embodiment 2 of a rectifying device in a distributed flowmeter of the present invention;

Fig. 4 is a structural schematic diagram of Embodiment 3 of a rectifying device in a distributed flowmeter of the present invention;

Fig. 5 is a structural schematic diagram of Embodiment 4 of a rectifying device in a distributed flowmeter of the present invention;

Fig. 6 is a structural schematic diagram of Embodiment 1 of a throttling circular plate in a distributed flowmeter of the present invention;

Fig. 7 is a structural schematic diagram of Embodiment 2 of a throttling circular plate in a distributed flowmeter of the present invention.

In the figure: 1. Cone b, 2. Rectifier, 3. Pipe, 4. Short pipe a, 5. Pressure valve a, 6. Balance valve, 7. Differential pressure transmitter, 8. Pipe flange, 9. Throttling circular plate, 10. Short tube b, 11. Pressure taking valve b, 12. Pipe a, 13. Pipe b, 14. Edge through hole, 15. Through hole a, 16. Conical truncated a, 17. Through hole b, 18. Conical frustum b, 19. Conical hole, 20. Cone a, 21. Cone c, 22. Conical frustum c, 23. Cone d.

Detailed ways

The utility model will be described in detail below in conjunction with the accompanying drawings and specific embodiments.

The utility model provides a distributed flow meter, as shown in Figure 1, including a pipeline 3, the two ends of the pipeline 3 are connected with a pipeline flange 8, the pipeline 3 is connected with a short pipe a4 and a short pipe b10, the short pipe a4 The pressure sensing valve a5 and the pressure sensing valve b11 are respectively connected to the short pipe b10, the pressure sensing valve a5 and the pressure sensing valve b11 are respectively connected to the differential pressure transmitter 7 through the pipeline a12 and the pipeline b13, between the pipeline a12 and the pipeline b13 Connected with a balance valve 6;

The throttling circular plate 9 is fixed inside the pipe 3, and several edge through holes 14 are evenly arranged on the throttling circular plate 9, and a through hole a15 is arranged at the center of the throttling circular plate 9, and a rectifying device is connected to the throttling circular plate 9 2.

Both ends of the edge through hole 14 are provided with chamfers or rounded corners.

As shown in Figure 2, the rectification device 2 includes a truncated cone a16, the large-diameter end of the truncated cone a16 is connected to one side of the throttling disc 9, a through hole b17 is arranged in the truncated cone a16, and the diameter of the small-diameter end of the truncated cone a16 is the same as The diameter of the through hole b17 is the same, the diameter of the through hole b17 is the same as that of the through hole a15 , and the circle centers of the through hole b17 and the through hole a15 are located on the same straight line.

The unconnected ends of the through hole b17 and the through hole a15 are provided with chamfers or rounded corners.

As shown in Figure 3, the rectification device 2 comprises a conical truncated b18, the large diameter end of the conical truncated b18 is connected to the other side of the throttling disc 9, the conical truncated b18 is provided with a tapered hole 19, the small diameter end of the tapered hole 19 is connected to The diameters of the through holes a15 are the same, the centers of the tapered holes 19 and the through holes a15 are located on the same straight line, and the diameter of the large diameter end of the tapered holes 19 is the same as that of the truncated cone b18.

The through hole b17 and the tapered hole 19 are provided with chamfered or rounded corners.

As shown in Figure 4, the rectification device 2 includes a cone a20 and a cone b1, the bottoms of the cone a20 and the cone b1 are connected to the throttling disc 9, the throttling disc 9, the cone a20 and the cone b are the same The shaft, cone a20 and cone b1 are located on opposite sides of the throttle disc 9 . The cone angle of the cone a20 is 30°-90°, and the cone angle of the cone b1 is 60°-150°.

As shown in Figure 5, the rectification device 2 includes a cone c21, a truncated cone c22 and a cone d23, a throttling disc 9, a cone c21, a truncated cone c22 and a cone d23 are coaxial, and the large diameter end of the truncated cone c22 and The bottom of the cone d23 is connected with the throttling disc 9, the truncated cone c22 and the cone d23 are located on opposite sides of the throttling disc 9, the large diameter end of the truncated cone c22 has the same diameter as the bottom circle of the cone d23, and the conical The small-diameter end of the truncated cone c22 has the same diameter as the bottom circle of the cone c21, and the small-diameter end of the truncated cone c22 is connected to the bottom circle of the cone c21.

As shown in FIGS. 6 and 7 , the edge holes 14 are round holes or fan-shaped holes.

The throttling circular plate 9 plays a supporting role, and the rectifying device 2 plays the role of rectifying and throttling.

The working principle of a distributed flowmeter of the utility model is: the utility model is connected to the pipeline under test through the pipeline flange 8, or the utility model is connected to the pipeline under test through clamping and welding installation methods, and the pipeline The fluid inside flows through the rectification device 2, and the fluid in the pipeline is blocked by the rectification device 2 and forced to divert. The high-speed fluid in the center of the pipeline passes through the through hole b17 and the through hole a15 in sequence, or passes through the taper hole 19, the through hole b17 and the through hole a15 in sequence , or the high-speed fluid in the center of the pipeline passes through the cone a20 or the cone c21 to distribute several edge through holes 14 on the throttling disc 9, the fluid outside the rectification device 2 in the pipeline continues to flow, is slowly compressed, and is passed by several edge through holes The hole 14 is further rectified, so as to optimize and adjust the flow curve of the fluid in the pipeline.

The rectification device 2 and the throttling circular plate 9 rectify the irregular flow state in the pipeline, distribute the internal and external fluids, and compress them slowly, reducing the vortex and rotating flow, and making the pressure velocity and distribution more uniform;

The fluid flows through the rectifying device 2 and the throttling disc 9 to generate a differential pressure between the front and rear. The differential pressure is led out through the short pipe a4 and the short pipe b10, and directly enters the differential pressure transmitter 7 through the pressure sensing valve a5 and the pressure sensing valve b11 for differential pressure measurement.

A balance valve 6 is connected between the pipeline a12 and the pipeline b13, and the balance valve 6 is used to protect the differential pressure transmitter 7 and adjust the zero point of the differential pressure transmitter 7.

A distributed flow meter is provided with a rectification device 2 and a throttle disc 9, and the fluid in the pipeline passes through the rectification device 2 and the throttle disc 9, so that the outlet velocity gradient of the fluid in the pipeline is reduced, and the pressure distribution is more uniform, so that The pressure is more stable, which is conducive to improving the accuracy of the flowmeter. The distributed rectification of the flow field and the optimization of the inlet shape are beneficial to improve the outflow coefficient. Because the fluid velocity and pressure gradient in the pipeline is reduced, the eddy current intensity is reduced at the same time, the pressure is more stable, and the range ratio can be improved. Because the fluid velocity and pressure gradient in the pipeline is reduced, and the eddy current intensity is reduced, the permanent pressure loss is reduced;

The pressure taking valve a5, the pressure taking valve b11 and the balance valve 6 constitute an external three-valve group to complete the needs of pressure taking and zero adjustment, reducing faults and leakage points, and reducing the additional error caused by the three-valve group in the measurement , Improve the reliability of the measurement pipeline.

Claims (10)

1. a distributed stream gauge, it is characterized in that: comprise pipeline (3), the two ends of pipeline (3) are connected with pipe flange (8), pipeline (3) is connected with short tube a (4) and short tube b (10), short tube a (4) and short tube b (10) is connected to pressure measuring valve a (5) and pressure measuring valve b (11), pressure measuring valve a (5) is connected with pressure difference transmitter (7) with pipeline b (13) respectively by pipeline a (12) with pressure measuring valve b (11), equalizing valve (6) is connected with between pipeline a (12) and pipeline b (13),

Affixed throttling plectane (9) in described pipeline (3), throttling plectane (9) is evenly provided with several edge through holes (14), throttling plectane (9) circle centre position is provided with through hole a (15), throttling plectane (9) is connected with fairing (2).

2. a kind of distributed stream gauge according to claim 1, is characterized in that: the two ends at described edge through hole (14) are provided with chamfering or rounding.

3. a kind of distributed stream gauge according to claim 1, it is characterized in that: described fairing (2) comprises frustum of a cone a (16), the bigger diameter end of frustum of a cone a (16) is connected with the side of throttling plectane (9), through hole b (17) is provided with in frustum of a cone a (16), the miner diameter end diameter of frustum of a cone a (16) is identical with through hole b (17) diameter, through hole b (17) is identical with through hole a (15) diameter, and through hole b (17) is located along the same line with the center of circle of through hole a (15).

4. a kind of distributed stream gauge according to claim 3, is characterized in that: described through hole b (17) and through hole a (15) non-link are provided with chamfering or rounding.

5. a kind of distributed stream gauge according to claim 4, it is characterized in that: described fairing (2) comprises frustum of a cone b (18), the bigger diameter end of frustum of a cone b (18) is connected with the opposite side of throttling plectane (9), taper hole (19) is provided with in frustum of a cone b (18), the miner diameter end of taper hole (19) is identical with through hole a (15) diameter, taper hole (19) is located along the same line with the center of circle of through hole a (15), and the bigger diameter end diameter of taper hole (19) is identical with the large footpath diameter of frustum of a cone b (18).

6. a kind of distributed stream gauge according to claim 5, is characterized in that: described through hole b (17) and taper hole (19) non-link are provided with chamfering or rounding.

7. a kind of distributed stream gauge according to claim 1, it is characterized in that: described fairing (2) comprises cone a (20) and cone b (1), cone a (20) is all connected with throttling plectane (9) with the bottom of cone b (1), throttling plectane (9), cone a (20) and cone b are coaxial, and cone a (20) and cone b (1) are positioned at the relative both sides of throttling plectane (9).

8. a kind of distributed stream gauge according to claim 7, is characterized in that: the coning angle of described cone a (20) is 30 ° ~ 90 °, and the coning angle of cone b (1) is 60 ° ~ 150 °.

9. a kind of distributed stream gauge according to claim 1, it is characterized in that: described fairing (2) comprises cone c (21), frustum of a cone c (22) and cone d (23), throttling plectane (9), cone c (21), frustum of a cone c (22) and cone d (23) is coaxial, the bigger diameter end of frustum of a cone c (22) is all connected with throttling plectane (9) with the bottom of cone d (23), frustum of a cone c (22) and cone d (23) are positioned at the relative both sides of throttling plectane (9), the bigger diameter end of frustum of a cone c (22) is identical with cone d (23) bottom surface diameter of a circle, the miner diameter end of frustum of a cone c (22) is identical with cone c (21) bottom surface diameter of a circle, the miner diameter end of frustum of a cone c (22) is connected with cone c (21) bottom surface circle.

10. a kind of distributed stream gauge according to claim 1, is characterized in that: described edge through hole (14) is circular hole or scallop hole.